Add hash functions.

[wbhart]

Fixes #120

[codecov]

Codecov Report

Merging #139 into master will not change coverage.
The diff coverage is 0%.

@@          Coverage Diff          @@
##           master   #139   +/-   ##
=====================================
  Coverage       0%     0%           
=====================================
  Files          34     34           
  Lines        2783   2834   +51     
=====================================
- Misses       2783   2834   +51

Impacted Files	Coverage Δ
src/Singular.jl	0% <ø> (ø)	⬆️
src/number/n_Zp.jl	0% <0%> (ø)	⬆️
src/number/n_unknown.jl	0% <0%> (ø)	⬆️
src/number/n_Q.jl	0% <0%> (ø)	⬆️
src/number/n_GF.jl	0% <0%> (ø)	⬆️
src/ideal/ideal.jl	0% <0%> (ø)	⬆️
src/module/vector.jl	0% <0%> (ø)	⬆️
src/matrix/matrix.jl	0% <0%> (ø)	⬆️
src/number/n_Z.jl	0% <0%> (ø)	⬆️
src/resolution/resolution.jl	0% <0%> (ø)	⬆️
... and 3 more

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[wbhart]

@hannes14 @raulepure @heiderich Someone needs to review this and/or merge it.

[wbhart]

@hannes14 @raulepure @heiderich

Without this patch, Singular.jl is now broken and fails tests on @rbehrends CI. It would be appreciated if someone could review the patch and merge it.

[thofma]

Give me push access and I will merge it ;)